Occasionally, your computer may display an error indicating Email Error 421. There can be multiple causes for this problem.
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SMTP (Simple Mail Transfer Protocol) is an Internet standard for sending e-mail.
SMTP is a text-based protocol in which the sender communicates withSend emails to recipients by entering commands and receiving a response code.
C: MAIL FROM:
S: 250 Ok
In this example, the client issues the MAIL FROM command and the server respondsfrom 250 approx.
Outlook Error 421 is a common critical SMTP error that prevents e-mail from transferring. The error must be corrected in a timely manner, otherwise it can cause great inconvenience, as all activities associated with your email account will be stopped and blocked. This error occurs when the server has temporary problems sending and receiving email. It can also happen if you have exceeded the limited limit for your email account.
Error 421 SMTP can be displayed in the following formats:
- “The server responded to with 421 cannot connect to the SMTP server” li>
- “An unknown error has occurred: Server error 421”
- “Your message could not be sent. Error 421 “
Common causes of this critical Outlook 421 error:
- Configuration errors in Outlook settings are the most common cause. However, this only happens if the email account was recently configured or reconfigured.
- Problems with firewalls do not cause built-in Windows firewalls. However, firewalls and third-party antivirus programs block connections to specific IP ranges to protect users from spam.
- Traffic is automatically blocked on port 25 or 26 to prevent users from accessing networks for spam.
- Failure of VPN connection also causes error 421
- PST file corruption
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Some common causes of this critical Outlook error are:
- PST memory size exceeds 2GB file size.
- Incorrect ISP settings.
- Slow internet connection
- PST file corruption
This is a critical Outlook error and should be addressed promptly. If you are late it can cause significant inconvenience.
Error code 421 prevents you from accessing your email account, sending and receiving emails, adding new contacts, viewing emails, mailing records, and more agenda and newspapers. In other words, it will block your email and exclude you from your account.
To fix this error code on your system, you don’t always need to hire a technician or call network staff to get the job done. This can be a critical bug, but the good news is that it is fairly easy to fix. Even if you don’t have the tech With good knowledge, you can still fix it.
Here are some of the best practices for solving this problem on your system: